lecture42_chem110_sas - Chemical Reactions: Equilibrium...

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Chemical Reactions: Equilibrium Part 3 CH110 FA11 SAS 1 FINAL EXAM Monday, Dec. 12 th , 2:30 PM Prepare for Recitation December 8 th ALEKS Objective 14 due SUNDAY December 4 th ANGEL Quiz 14, December 8 th ALEKS FINAL ASSESSMENT: Deadline December 9 th Lecture 40: November 30 th Lecture 41: December 2 nd Lecture 42: December 5 th Read: Ch. 15.1 – 15.5 HW Preparation: BLB 15: 21,28,29,32,35,46; Packet 15: 1-10
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CH110 FA11 SAS 2 By the end of Today’s Lecture you should know: Calculations involving K eq Predicting the direction of a reaction using Q Le Châtlier’s Principle Catalysis KEY QUESTIONS: THE BIG PICTURE Chemical Reactions: Equilibrium Part 3 Do real reactions always proceed to completion? What forces drive the reaction process? How do the properties of heterogeneous reactions differ from homogeneous? Remember: macroscopic properties come from microscopic origins What is Le Châtlier’s Principle? When a system is disturbed, why does it attempt to return to equilibrium? How fast do systems reach equilibrium?
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Another Example Calculation CH110 FA11 SAS 3 H 2 (g) + F 2 (g) 2 HF(g) = 1.15 x 10 2 3.0 mol of each gas was added to a 1.5 L vessel. What are the equilibrium concentrations of all species? Initial concs: [H 2 ] = [F 2 ] = [HF] = 2.0 M K c = [HF] 2 [H 2 ] [F 2 ] H 2 (g) + F 2 (g) 2 HF(g) initial 2.0 2.0 2.0 change equm Q = K eq = 1.15 x 10 2 =
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CH110 FA11 SAS 4 Take square root [H 2 ] = [F 2 ] = [HF] = x = Check the answer: Continued…. . K
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This note was uploaded on 01/18/2012 for the course CHEM 110 taught by Professor Hofmann,brucerob during the Fall '08 term at Pennsylvania State University, University Park.

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lecture42_chem110_sas - Chemical Reactions: Equilibrium...

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